Demonstrating formation of potentially persistent transformation products from the herbicides bromoxynil and ioxynil using liquid chromatography-tandem mass spectrometry (LC-MS/MS)
作者:Marie KK Nielsen、Maria S Holtze、Bo Svensmark、René K Juhler
DOI:10.1002/ps.1311
日期:2007.2
shown that potentially persistent transformation products can be formed from the herbicides bromoxynil (3,5-dibromo-4-hydroxybenzonitrile) and ioxynil (3,5-diiodo-4-hydroxybenzonitrile), and possible leaching to groundwater is discussed. A similar process to the formation of BAM (2,6-dichlorobenzamide) from the herbicide dichlobenil (2,6-dichlorobenzonitrile) can be anticipated as bromoxynil and ioxynil
结果表明,潜在的持久性转化产物可以由除草剂溴苯腈(3,5-二溴-4-羟基苄腈)和苯氧腈(3,5-二碘-4-羟基苄腈)形成,并讨论了向地下水淋溶的可能性。可以预见到与由除草剂二氯苯腈(2,6-二氯苄腈)形成BAM(2,6-二氯苯甲酰胺)相似的过程,因为溴苯腈和碘苯腈是二氯苯腈的类似物,它们被腈水解酶,腈水合酶和酰胺酶降解。 。使用培养的Variovorax sp。进行的生物降解研究。DSM 11402是一种常见于土壤中的物种,证明碘克腈和溴苯腈在2-5天内被完全转化为相应的酰胺。这些酰胺在18天内没有进一步降解,也未观察到其他降解产物的形成。这些结果与二氯苯腈的生物降解实验一致。在土壤中,二氯苯腈被转化为唯一可观察到的降解产物BAM,该降解产物持久且可移动,在5000份丹麦地下水样本中有19%被发现。Variovorax sp。已知可降解非卤代类似物苯甲酰胺,表明这三种酰胺的降解可能受卤代取